You missed the first one, the NAP250BD - “Bolt-Down” 
Thanks - Edited original for completeness
I suppose calling the latest New Classic NAP250 the NAP250-3 makes some sense;
The first series of 250s were the 250BD, then the 250CB, then the 250 Olive - all basically similar in overall design, with incremental improvements over the years, but where you could almost swap amp or reg boards from one version to the next such were the similarities.
Then came the second series, with a new overall design, here called the NAP250-2, followed by the NAP250DR.
Then came the third series, again with a new overall design, here called the NAP250-3.
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sounds like one of the answer for getting the Dusty Bin prize in 3-2-1
Well shoe-horned
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Isn’t the Olive 250 different to its predecessors in that it can be (could be) DR’d where the CB could not?
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Update after 4 days ownership.
NAP does make a humming noise when in use but fortunately when in standby mode I can’t hear from listening position - solution to play more music. All other equipment very quiet.
Bass and dynamics mixed with room mode resulted in very powerful sub bass peak - think I’ve cured with a limited frequency range DSP filter. Very happy with the consistency of the remaining frequency range.
Stand outs so far spectral balance (maybe down to volume control), vocal presentation and now after tweaking tight, fast and deep bass.
I mention the latter as lack of bass at low volume was raised by someone following a demo but not my experience. With preamp max volume at 85 and volume at 40 I get ave 60dBs and spades of dynamics.
Hope other new owners are enjoying the kit.
Edit: I should add I use volume levelling in Roon, set to -15 LUFS, which is equivalent to c15dBs roughly.
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My 250DR makes no humming noise. I wouldn’t expect the new 250 to hum.
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Doc, off topic, for which I apologise, but were you involved with the VW Up! forum at one time?
No, the Olive NAP250 can’t be DRed.
There is nothing that appears to be in the new classic that stops Humming when the device is fully powered up, and the mains supply suffers from High Voltage or DC Offset. But it should stop humming when in standby mode as power is not then going through the toroidal transformer.
This all depends on how clean the mains is that it is connected to.
Sorry I’m not convinced of that - why doesn’t the power supply make a noise given it has a larger toroidal transformer?
I think this is the risk you run with Naim gear.
I’m not delighted about it don’t get me wrong and it shouldn’t be the case but had it with my last amp and although I returned it to Salisbury it was never eliminated.
That said you are right I will look at getting dedicated mains though.
Best.
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Yes. I was moderator
Perhaps have a read of the new FAQ entry
That seems to be a very hard thing indeed. I usually send back stuff because it’s too complex. I tell developers that I’m not so smart and therefore need easy understandable variable names.
Fair enough but I have literally tested this. Hairdryer somewhere else in the house on the same power bank = hum. No hairdryer = no hum.
Yes. My hicap is more silent after we got a new fridge. When one switches in an electric heater, it’s immediately audible.
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Is it, though? One of the Oxford dictionaries defines classic as “accepted or deserving to be accepted as one of the best or most important of its kind”. I don’t see this contradicts the new designation and I imagine Naim think it describes the new boxes rather well.
Roger
I haven’t had any humming from any of my black boxes that I can recall. I recall some of the olive boxes exhibiting a slight hum but none with my current kit, all on a dedicated line.
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My SN3 and hicap dr both hum. The SN3 is audible at 6m in a quiet room.
As much as I love Naim equipment the humming business is the one thing that would stop me purchasing further products. I’m glad I’m not the only one on the forum who finds it intensely irritating.
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